Ellipsograph.



W. s. ELLIOTT.

ELLIPSOGRAPH.

APPLICATION FILED APRA, 1912.

1,055,303. Patented Mar. 4, 1913.

2 SHEETS-SHEET 1.

ATTORNEYS W. S. ELLIOTT.

ELLIPSOGRAPH.

yrLIoATIoN FILED APRA, 1912.

1,055,308. Patented Mar. 4, 1913.

SHEETS-SHEET 2.

WITNESSES 6. .MQvmm maar ,mzzl-oz;

By Md /1 TTRNE YS IN VE N TOI? WILBUR S. ELLIOTT, OF PRESCOTT, ARIZONA.

ELLIPSOGMPH.

Specification of Letters Patent.

PatentedMar. 4, 1913.

Application led April 4, 1912. Serial No. 688,398.'

To all whom t may concern:

Be it known that I, WILBUR S. ELLIo'rr, a citizen of the United States, and a resident-fof Prescott, in the county of Yavapai and State of Arizona, have invented a new and `Improved Ellipsograph, of which the following i's a full, clear, and exact description.

The invention relates to drawing instruments for describing 'an ellipse of any size within the capacity of the instrument, and it comprises in its construction various novel features permitting of a ready adjustment to vary the size of the ellipse, as desired, and to promote convenience in manipulating the members.

My improved construction will be particularly described in connection with the specific embodiment illustrated as one example of means for carr ing out the invention, and the distinctive eatures will be further deiined in the claims.

Reference is to be had to the accompanying drawings forming a part of this speciication, in which similar characters of reference indicate corresponding parts in all the figures.

Figure 1 is a erspective view of an ellipsograph embo ying my invention; Fig. 2 is a vertical section showing portions of the instrument; Fig. 3 is a sectional plan view; Fig. 4 is an inverted plan view of the graduated pen or pencil carrier; and Fig. 5 is a transverse vertical section through the said carrier and a supported penholder, the section being taken approximately on the line 5 5 of Fig. 2.

Briefly described', the instrument comprises a standard constituting a center, a circular disk mounted on the standard for angular adjustment to correspond with the ellipse to be described, and a frame also supported on the standard for revoluble movement thereon, the said frame having a swinging portion and being provided with a pen carrier embracing the standard, and also with a roller contacting with the perimeter of the mentioned adjustable disk, the arrangement being such that 'as the frame is revolved around the standard, the roller will travel in a path corresponding with the angular adjustment of the disk and in contact with the latter, and the pen or pencil ward and outward in an elliptlcal path.

In constructin the articular embodiwiu travel with the roller and be shifted inment illustrated t e stan ard 10 is provided I with a point or center 11, and. with any suit.

able handle such as a head 12 for holding the standard in position. Suitable supports may be employed advantageously, consistlng of legs 13 joined to the head 12 by arms 14. A circular disk 15 is clamped to radial arms 16, for angular adjustment relatively to the standar To eiiect the desired clamping and adjustment of the` disk the latter is formed with a cruciform` opening, consisting of slots at right angles to each other, the smaller slot 17 receivin the arms 16 in the plane of the disk. he'clamp plates 18 are disposed on the opposite sides of the disk and have semicircular bearing portions 19V receiving the arms 16. Rivets 18a clamp the plates 18 at one side and the plates are tightened or loosened at the opposite side by studs 20 and knurled nuts 21 threaded onto said studs.

The arms 16 are preferabl formed on a collar 22 held in posltion on t e standard 10 form opening in the disk 15. Above the collar 22 an elongated'sleeve 24 is mounted for revoluble movement ony the stan-dard, and between the said sleeve and the collar 22, an expansible spiral sprin 25 is fitted and inclosed by a housing 25EL tted to slide on the sleeve 24, the said sprin 25 desirably abutting against seats 26, 2g, fitted respectively to the said sleeve and collar. The sleeve 24 carries a frame 28 fixed thereto and disposed vertically so that it forms upper and lower bearings 29, 29", for receiving the stud journals 30, 30, of a U- shaped swinging frame 31, having upper and lower arms 32 which are offset at their outer ends at an angle, as shown in Fig. 1, to form bearings for a rod 33, to which is fastened by a bracket 34, the carrier 35 for a pen 36 or pencil. The en is held as by a s et screw 37 on a penhol er block 38, comprlsing in the present instance, upper and lower plates held together and to the carrier 35, by any suitable clamping device, as a bolt. 39 and knurled nut 40. The rod 33 has a turning movement in the arms 32 when it is revolved around the standard '10, and said rod 33, vand -withjt the pencarrier 35, has vertical movement in the arms 32, the extent of the vertical 'movement in an upward direction being limited by the bracket 34 and in the opposlte direction by a'collar 33a and pressed gravias the roller-41 follows the perimeter of the disk 15. The vertical roller 41 is also mounted in the frame 31A near the outer ends of the arms 32, and in order that' the said roller ma be held at all times in yielding contact with the perimeter of the disk 15, suitable springs are provided, which are illustrated as plate springs 42 secured to the frame 28 near the top andbottom and bearp ing against the respectivel arms 32.

The pen carrier 354 is in practice, formed with a scale, as shown in Fig. 4, and the pen holder .38 is shifted on carrier 35 to or from the center '11 according to the size of the ellipse, the distance from the center to the pen representing one half of the minor axis. The adjustment of the pen is effected when the swinging frame is turned to bringl the pen carrler to a position transverse to the position shown in Fig. 1, so as to be disposed in the direction correspondlng with the directionrof the arms A16, and vhence corresponding with the major axis of the ellipse presented by the tilted disk, in which position the inner end of the slot-35 of the pen carrier will be adjacent to the standard 10. `The scale is usedto indicate the adjustment whether the pen is to be set for the major axis, or the disk set to formthe minor axis, as willv be obvious. Y

With the described construction, to operate the instrument, the penholder 38 having been positioned on the carrier bar 35 a distance from the center 11 to describe an ellipse of the required size, the sleeve 24 is pressed downwardly against the tension of the spiral spring 25, to carry the frames downward to bring the pen into Contact with the paper, whereupon the sleeve is rotated to cause the roller 41 to travel around the perimeter of the disk 15, whereby the pen willdescribethe ellipse. U on release of the sleeve 24, the spring 25 will immediately lift the pen from the paper. v

Having thus described my invention, l claim as new, and desireto vsecure by Letters Patent,- v

1. An ellipsograph, comprising a stand` ard constituting a center, a tiltable circular disk on the standard, a frame mountedY .on

the standard for rotary movement, a second-- spring actuated frame mounted to swing in the first frame, the said second frame yield- 1 ingly engaging ,the perimeter of the disk, and a pen carrier on said frame and disposed in a plane transecting the axis of the Standard.

'2. An ellipsograph, comprisingflfa standard constituting' a center, a circulardisk` mounted in a plane transectingthe axis -of the standard, a frame mounted to turn on' the standard, a second frame 'mounted to swing on the first frame and havinga member contacting with the perimeter of' the disk, and a pen or pencil carrier mounted on said second frame and. provided with a scale and with a means for adjstably supporting the pen or pencil, the said second frame and the carrier for the pen or pencil being movable toward and from the center as the said frame conforms its movements to the perimeter of the disk.

. 3. The combination with a standard of"a circular disk mounted on the standard and adjustable to var its angle, la' frame mount- 'ed to slide on t estandard. and to -rotate thereon, a spring normally tending to raise said frame, a second frame pivoted on theirst mentioned frame and provided with a roller to contactwith the, perimeter of the disk, a horizontal pen carrier secured to the pivoted frame below the disk, and a pen v adj us'tably supported on -said carrier.

4. An ellipsograph com rising a standard' standard, a roller vcarried by -saidsecond frame and movable to contact with; the per-- 'imeter of the disk, springs o n the main frame pressing against said second frame to swing 1t toward the standard, a-horizontal licpen' carrier mounted on' said second framev and straddling vthe standard, andfa" pen holder on said pen -carrien 5. An ellipsograph com constituting a center, `a titable circular disk on the standard, a sleeve mounted tov rotate on the standard and to slide vertically `thereon, aframe' carried by said sleeve ar spring normally ltendin to raise said s ,eev'e and frame, a second /the first frame thel free end ofthe second frame being adapted to swing toward and from thedisk, said swinging frame4 having a member in contact vwith the perimeter of the disk, and a pen carrier mounted "on said F 1.115. rismga standard v v' ame pivotally mounted on 1 swinging frame and inovable therewith relative to said standard-M V p .v

6. An ellipsograph comprising a standard iconstituting a center a tiltable circular disk In testimony whereof I have signed my on-the standard, a rame lmounted to slide name to this specification in the presence of 10 4ondthe standard and to rtat theleon, a sec two subscribing witnesses,

on frame pivoted to t e rst rame an having a. member contacting with the per- WILBUR S' ELLIOTT imeter of the disk, and a slotted penrcarrier Witnesses:

straddling the standard and carried by said ZIBA 0. BROWN, second frame. E. S. 

